Cyclone 10GX: Do I need 100 MHz CLK_USR input with PCI Express?

[NWein]

On a Cyclone 10GX, if a single lane of PCIe is the only transceiver I'm using, do I need a 100 MHz CLK_USR input?  I imagine I probably do, but it's not 100% clear from the docs I have read.

[SengKok_L_Intel · Accepted solution]

Hi,

This is required to connect a free running clock for the CLKUSR. else the transceiver calibration cannot be started, and it will impact the PCIe.

Intel® Cyclone® 10 GX Device Family Pin Connection Guidelines

Regards -SK

[NWein]

Thanks, just wanted to be sure.

[SengKok_L_Intel]

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